new natural gas furnace or mini ductless heat pump?
booboo60
10 years ago
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10 years agobooboo60
10 years agoRelated Discussions
Ground water heat pump + natural gas
Comments (17)I'll try to answer some things as best I can and comment on all these items (appreciate all the input!) I had everything checked out/cleaned last year, there are no functionality issues that I can tell. I used gas for part of the winter last year and also the geo, both heated just fine, geo also cools just fine. It just worried me that the previous owner used the gas rather than the geo when I had assumed geo is so much more efficient. He ran the tstat in EM mode to force gas only (which is what I am doing now). I would like to use the geo if it makes sense to. Is it safe for the equipment to run geo with a setback? Maybe a large enough setback that the gas does the leg work in order bring the initial temp back up, then the geo maintains? The home is very well built and sealed, energy audit was done and insulation in key areas was added. The previous owner did all this and left me with a packet of info on all of it. The geo is a Bard, I'll have to double check the model. I know nothing about how the loops are run and honestly I'm still not 100% on the open vs closed. I will ask the previous owner who installed the geo therm unit and maybe I can get some answers. There is a manual about the unit but I don't recall seeing much more than that regarding the loops and such. Fairly certain the blower is variable. When I have the temp the same 24/7 it it is constantly moving air but at pretty low even speed. The sprinkling may be an unnecessary variable I/he threw in here. It is not part of the geo system as far as I know. Previous owner mentioned the lawn sprinkler system and that he watered every day for 5-6hrs (large yard) and that this may have led to whatever pump went out that he had to replace. The way he explained it made me think that the main well was feeding the sprinklers, geo, house, everything and the figured he had overworked it or something. Maybe this isn't how it works and these things all have their own pumps. The meter the tech installed last year I think shows PSI and when I have pulled the ring to make it show a reading it always between 5 and 6, normally around 6. I think this is good? I'm trying to understand why the owner would install a nice new nat gas furnace on top of the geo but I think it all goes back to whatever pump failed and him thinking that it would put less stress on it. -I'm glad to have to have options! But wondering how/if/should I try to figure out a way to utilize both? Smarter tstat? I know there are a lot of holes here and I apologize for that....See MoreSeattle- Heat Pump/Gas Furnace vs AC/Gas Furnace
Comments (13)You should definitely be pricing with just heat pump. I live in NC which probably is a bit colder in the winter. We get down to the teens but only 15 nights a year maybe. Our winter average low is about 30. Under 10 degrees is definitely a news story. I have 5000 sq ft. I'm looking at my NG bill of $30. I have dual fuel and seer 16 heat pumps. Last winter was very cold and I spent about $700 with $200 being gas. This winter is going to be $120 in gas. My electric rates are similar to yours without the first 1000 discount. What is my point? Your gas usage will likely be $100 a year. Even if that were replaced with all heating strips, you'd be saving $200 a year or so. Since it would probable be 80% heat pump still, the dual fuel is only saving you $40 a year. So a $2500 furnace to save $40 a year seems a little crazy (on dollars alone). Turns out for me, it is probably worth it but only marginally so. I have a 90% (which you should be able to do as mine is basement with horizontal PVC exhaust). It probably saves $60-$70 on an average year. Probably cost $2000 (new house - I can't remember). What is that a 30 year payback (or never if you count interest or NG rates increase)? You do get some flexibility and you can setback at will with dual fuel. That is worth something....See MoreAC + gas furnace vs, Heat Pump + furnace
Comments (5)All units are Bryant Furnace = 355BAV A/C = 127A Heat Pump = 226A Had to order today to take advantage of rebate offer that ends 8/31. Never could figure out how to estimate the cost of running the heat pump vs. the gas furnace and couldn't locate any on-line calculators/spreadsheets that would help. Figured I'd save a bunch with new 95% furnace over the old sigle-stage 80%, and the new 17 SEER a/c over the old single-stage 10. It's small house (1450 sf) and well insulated, and I didn't know if I'd squeeze enough additional savings with a heat pump to justify the extra initial cost of the pump plus whatever extra cost would be involved in replacing it sooner because of running it much more. When in doubt, play conservatively (at least where money is involved), so I went for the a/c unit. Wish I'd discovered this website a month earlier. Thanks to all those who responded....See MoreDual Fuel Heat Pump w/ gas furnace or just heat pump?
Comments (17)I'm leaning towards just heat pump with heat strips. That should be fine for your area. If you plan on keeping it that warm in the house as you say in your OP, I would get the Bosch Inverter heat pump as it produces heat clear down to about 5-6 degrees ambient and very efficient at what it does. Then use the strip heat as you need it. I don't know that you'll find a contractor though for this for a new construction job as Bosch just recently came to the Houston market a few months ago. The distributor network for Bosch is in it's infancy... so there are pros and cons for choosing this brand. For what it does / how it does it --- it's a game changer for my market. (Katy, Texas area) As a comparison --- an average run of the mill single speed heat pump will probably struggle once temps drop into the 20's for any significant amount of time. They are efficient when compared to strip heat (utility bill cost wise) but there are higher limitations with those. I've gotten email notifications from my electric provider that they are estimating my next electric bill at less than $50 for November. This may wind up being my lowest electric bill ever for my power rate of 12 cents per KWH. With that said, I keep it quite chilly during the winter and my house is all electric (no gas at all). I shut it off at night and really just use it to take the chill out of the house in the morning. If it gets really cold here, I will probably just heat the main part of the house over night --- as I have it attached to a 4 zone duct system. (This is to explain the how and why my electric bill is so low -- design of the HVAC system is a big part of it.)...See MoreUser
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10 years ago
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